999863491 has 8 divisors (see below), whose sum is σ = 1125946368. Its totient is φ = 879645000.

The previous prime is 999863489. The next prime is 999863587. The reversal of 999863491 is 194368999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999863491 - 2¹ = 999863489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999863411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1465735 + ... + 1466416.

It is an arithmetic number, because the mean of its divisors is an integer number (140743296).

Almost surely, 2^999863491 is an apocalyptic number.

999863491 is a deficient number, since it is larger than the sum of its proper divisors (126082877).

999863491 is a wasteful number, since it uses less digits than its factorization.

999863491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932193.

The product of its digits is 3779136, while the sum is 58.

The square root of 999863491 is about 31620.6181312131. The cubic root of 999863491 is about 999.9544949293.

The spelling of 999863491 in words is "nine hundred ninety-nine million, eight hundred sixty-three thousand, four hundred ninety-one".